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arXiv · 1506.03889

The unexpected binding and superconductivity in SbH4 at high pressure

Yanbin Ma·Defang Duan·Da Li·Yunxian Liu·Fubo Tian·Xiaoli Huang·Zhonglong Zhao·Hongyu Yu·Bingbing Liu·Tian Cui
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Abstract

The semimetal antimony (Sb) element doped into hydrogen has been performed theoretically to explored high-pressure crystal structure and superconductivity of antimony hydrides. The unexpected stoichiometry $\textrm{SbH}_\textrm{4}$ with $P6_3/mmc$ symmetry is found to have most negative enthalpy and embody the coexistence of covalent and ionic bonds. It is a metallic phase and stable in the pressure ranges of 127-300 GPa. Furthermore, a superconducting critical temperature ($T_c$) of 106 K is obtained at 150 GPa by employing the Allen-Dynes modified McMillan equation. In addition, an extrusive distinguishing feature is the presence of soft phonon modes, which is primary contribution to the strength of electron-phonon coupling.

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Yanbin Ma, Defang Duan, Da Li, Yunxian Liu, Fubo Tian, Xiaoli Huang, Zhonglong Zhao, Hongyu Yu, Bingbing Liu, Tian Cui. 2015-06-12. The unexpected binding and superconductivity in SbH4 at high pressure. https://arxiv.org/abs/1506.03889

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